3 Answers
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I have a similar background: After several years of web UX I and startet working on mobile UX about 1 year ago. I think many basics aren't different from web UX but there are some things to keep in mind and some additional possibilities. Here's what comes to my mind (I'm talking of smart phones only):

I've done some mobile design and have a web background and it's certainly challenging.

Phil covered a lot of the resources above. one point to be aware of is the difference between the various mobile platforms and the different standards that they have. For example Iphones etc generally have a software based back button where as android devices have a button on the device.